空手道:如何遍历JSON有效负载和打印每个字段的值长度

import json

def print_field_lengths(json_payload):
    # 解析JSON有效负载
    data = json.loads(json_payload)

    # 遍历JSON字段
    for key, value in data.items():
        # 计算字段值长度
        if isinstance(value, str):
            value_length = len(value)
        else:
            value_length = len(str(value))

        # 打印字段名称和值长度
        print(f"字段 '{key}' 的值长度为: {value_length}")

# 示例JSON有效负载
json_payload = '''
{
    "name": "John Doe",
    "age": 30,
    "email": "johndoe@example.com",
    "address": {
        "street": "123 Main St",
        "city": "New York",
        "country": "USA"
    }
}
'''

# 调用函数打印字段值长度
print_field_lengths(json_payload)